1. Notes 4.2 Scatter Plots and the Coordinate Plane A coordinate plane uses ordered pairs such as (4,2) to name points. The numbers are the coordinates of the points. A coordinate plane has two axes, the x-axis (horizontal) and the y-axis (vertical). The first number of the ordered pair is the x-coordinate and the second number is the y-coordinate. The origin is located where the two axes cross. The axes cross at (0,0).

2. A scatter plot is a collection of points in a coordinate plane that represents a relation- ship between two quantities.

3. URL of the day –http://regentsprep.org/Regents/math/data/s catter.htm http://regentsprep.org/Regents/math/data/s catter.htmhttp://regentsprep.org/Regents/math/data/s catter.htm http://www.shodor.org/interactivate/disc ussions/fd2.html http://www.shodor.org/interactivate/disc ussions/fd2.html http://www.shodor.org/interactivate/disc ussions/fd2.html http://www.shodor.org/interactivate/disc ussions/fd2.html

4. homework answers 9) (0,3) 10) (2,5) 11) (0,0) 12) (2,0) 13) (3,3) 14) (5,4)

7. Spiral Review 1) mpa: With each fold, the number of regions doubles. 2) 5 3) 28 4) 14 5) 14 6) 14 7) 4 8) > 9) > 10) > 11) > 12) P=3 mi. A=9/16 mi. 2 13) P=17 4/5 ft. A=18 7/10 ft. 2 14) P=8 yd. A=2 2/3 yd. 2

8. Using Technology 1) 9.2; yes; The area is the sum of the two widths. 2) 13.4; yes; The area is the sum of the two widths. 3) 24.2; yes; The area is the sum of the two widths. 4) 35.8; yes; The area is the sum of the two widths. 5) Yes, but frames whose outer width is other than one greater than its inner width, the difference is the product of the frame width and the sum of the inner and outer width.